Quasiparticle dynamics in overdoped Bi1.4Pb0.7Sr1.9CaCu2O8+δ: Coexistence of superconducting gap and pseudogap below Tc

Saritha K. Nair, Xingquan Zou, Elbert E. M. Chia, Jian-Xin Zhu, C. Panagopoulos, S. Ishida, and S. Uchida
Phys. Rev. B 82, 212503 – Published 6 December 2010

Abstract

Photoexcited quasiparticle relaxation dynamics in overdoped Bi2Sr2CaCu2O8+δ (Tc=65K, hole doping p=0.22) single crystal is investigated as a function of temperature. We provide evidence of a 22meV pseudogap (T100K) at this doping level. Moreover, this pseudogap vanishes at T. Our data support the scenario where both the superconducting gap and pseudogap coexist in the superconducting state. Our results also suggest an increased scattering rate between electrons and spin fluctuations as the sample enters the pseudogap phase.

    • Received 15 September 2010

    DOI:https://doi.org/10.1103/PhysRevB.82.212503

    ©2010 American Physical Society

    Authors & Affiliations

    Saritha K. Nair, Xingquan Zou, and Elbert E. M. Chia

    • Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore, Singapore

    Jian-Xin Zhu

    • Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

    C. Panagopoulos

    • Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore, Singapore and Department of Physics, University of Crete and FORTH, 71003 Heraklion, Greece

    S. Ishida and S. Uchida

    • Department of Physics, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan

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    Issue

    Vol. 82, Iss. 21 — 1 December 2010

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